diff --git a/hello-world.php b/hello-world.php
index 4c88d22..179ce2b 100644
--- a/hello-world.php
+++ b/hello-world.php
@@ -5,9 +5,13 @@
 // It's been provided as a convenience to get you started writing code faster.
 //
 
-function helloWorld($name)
-{
-    //
-    // YOUR CODE GOES HERE
-    //
-}
+
+  function helloWorld($name = null)
+  {
+    if ($name === null){
+      return "Hello, World!";
+    }
+    else {
+      return "Hello!". " ".($name);
+    }
+  }